<template>
    <!-- 登录页面的整体盒子 -->
    <div class="login-container">
        <!-- 登录的盒子 -->
        <div class="login-box">
            <!-- 标题的盒子 -->
            <div class="title-box"></div>
            <!-- 登录的表单区域 -->
            <el-form :model="loginForm" :rules="loginRules" ref="loginForm">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" placeholder="请输入用户名" maxlength="10" minlength="1"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" type="password" placeholder="请输入密码" maxlength="15"
                        minlength="6"></el-input>
                </el-form-item>
                <el-form-item>
                    <el-button type="primary" class="btn-login" @click="clickLogin">登录</el-button>
                    <el-link type="info" @click="$router.push
                    ('/reg')">去注册</el-link>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    name: 'Login',
    data() {
        return {
            // 登录表单的数据对象
            loginForm: {
                username: '',
                password: ''
            },
            // 登录表单的验证规则对象
            loginRules: {
                username: [
                    { required: true, message: '请输入用户名', trigger: 'blur' },
                    { pattern: /^[a-zA-Z0-9]{1,10}$/, message: '用户名必须是1-10的字母数字', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { pattern: /^\S{6,15}$/, message: '密码必须是6-15的非空字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods: {
        clickLogin() {
            this.$refs.loginForm.validate(async valid => {
                if (!valid) return
                // 1.发起登录的请求
                const { data: res } = await this.$http.post('/api/login', this.loginForm)
                // 2.登录失败
                if (res.code !== 0) return this.$message.error(res.message)
                // 3.登录成功
                this.$message.success(res.message)
                // 4.把 token 记录到 vuex 中
                this.$store.commit('updateToken', res.token)
                // 5.登录成功之后,跳转到后台主页
                this.$router.push('/')
            })
        }
    }
}
</script>

<style lang="less" scoped>
.login-container {
    background: url('../../assets/images/login_bg.jpg') center;
    background-size: cover;
    height: 100%;

    .login-box {
        width: 400px;
        height: 270px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        padding: 0 30px;
        box-sizing: border-box;

        .title-box {
            height: 60px;
            background: url('../../assets/images/login_title.png') center no-repeat;
        }

        .btn-login {
            width: 100%;
        }
    }
}
</style>
